<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta id="viewport" name="viewport" content="width=device-width, initial-scale=1">
    <title></title>
    <!-- <script type="text/javascript" src="/assets/js/def.js"></script> -->
    <link rel="stylesheet" href="btn.css">
  </head>
  <body>
    <h3>btn.css</h3><hr>
    <button>button</button>
    <button class="btn">button.btn</button>
    <a href="" class="btn">a.btn</a>
    <input class="btn" type="button" value="input.btn[button]">
    <input class="btn" type="submit" value="input.btn[submit]">

    <h3></h3><hr>
    <button class="btn btn-primary">btn-paimary</button>
    <button class="btn btn-success">btn-success</button>
    <button class="btn btn-warning">btn-warning</button>
    <button class="btn btn-error">btn-error</button>
  </body>
</html>
